Just Mobile has launched the Just Mobile Gum++, a high-capacity backup battery for smartphones, tablets and USB-powered devices. It has a suggested retail price of US$89.95.

Available in a range of colors, the Gum++ is clad in a glossy, hard-wearing shell. Inside, a 6000mAh battery has enough capacity to recharge a smartphone up to three times, says Erich Huang, co-founder of Just Mobile. Its high- power USB output keeps charge times to a minimum.

You can refill the Gum++ from USB using the supplied cable. Its five LED indicators help you keep track of the remaining charge. For more info go to www.just-mobile.com .